JPH0339006Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a harvester that performs threshing work to extract grains while reaping grain culms.

[Prior art]

Harvesters perform reaping and threshing work by transmitting the power from the engine to the reaping section, threshing section, etc. through the reaping clutch, threshing clutch, etc. However, the reaping clutch has an abnormal reaping load. When the engine size becomes larger, a so-called safety clutch mechanism is provided that does not transmit power from the engine even when power is being transmitted. A pawl clutch is generally used as a safety clutch mechanism, and when the reaping section is overloaded, the clutch half on the reaping section side is not rotated, but only the clutch half on the engine side is rotated.
The clutch half and the clutch half on the cutting section side were repeatedly engaged and disengaged.

[Problem that the invention attempts to solve]

In conventional harvesters, the reaping section becomes overloaded, and even though the reaping clutch is in the state of transmitting power, the safety clutch mechanism is activated and the power is not being transmitted. Continuing work under these conditions caused various inconveniences. For example, when controlling vehicle speed based on the rotation speed of the handling drum in the threshing section, if the safety clutch mechanism is activated due to overload of the reaping section, the reaping section will not be driven and the grain culm will be fed to the threshing section. It stopped being done,
The handling cylinder in the threshing section is under a light load, the speed of the machine is increased, and the uncut grain culm is damaged.

[Means for solving problems]

The present invention was developed in view of such circumstances, and it transmits and cuts off power to the reaping section, and when the power is being transmitted, the reaping section is engaged due to overload.
The reaping clutch is equipped with a safety clutch mechanism that repeats disengagement, and a detector for the engaged and disengaged states of the reaping clutch, and the detector detects the number of repetitions of the engaged and disengaged states of the reaping clutch within a predetermined period of time. The feature is that when the predetermined value is reached, the movement of the aircraft is stopped.

[Effect]

In the present invention, if the number of times of engagement and disengagement of the reaping clutch, which transmits and interrupts power to the reaping section, is repeated over a predetermined value within a predetermined period of time, the reaping clutch is in a power transmitting state. Regardless, the safety clutch mechanism stops the movement of the machine assuming that no power is being transmitted to the reaping section.

〔Example〕

The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 2 is a partially cutaway schematic left side view of the harvester according to the present invention. In the figure, reference numeral 7 denotes a reaping section, which is composed of a cutting rod 4, a cutting blade 5, a pulling device 6, a vertical conveyance device 8, etc., and the power of the engine is supplied to the reaping section 7 through a reaping clutch, which will be described later. The information is transmitted to the cutting blade 5, the lifting device 6, and the vertical conveying device 8.
etc.

A threshing device 3 is provided above the traveling crawler 1 on the rear side of the reaping section 7, and the grain culms harvested by the reaping section 7 are sent to the threshing device 3 via upper and lower conveying devices and a vertical conveying device 8. The grains are fed and threshed by the handling cylinder 31 in the threshing device 3, and the threshed grains are fed to the paddy tank.

A handling cylinder 31 in the threshing device 3 is provided with a handling cylinder sensor 32 that detects its rotation speed.

A driver's seat 2 is disposed in front of the right side of the threshing device 3, that is, on the right side of the reaping section 7, and a main shift lever 10 in the main transmission is disposed in the side column 9 on the left side. By rotating the main gear shift lever 10, the four forward gears "F4" to the first gear "F1", the neutral gear "N" to stop traveling, and the reverse gear "R" to cause reverse traveling are set. The aircraft travels and stops at the speed specified in .
The main shift lever 10 is provided with a main shift sensor 12 that detects the set travel gear of the main transmission based on its rotational position.

A reaping clutch lever 11 is disposed on the operating column 13 in front of the driver's seat 2. The reaping clutch lever 11 sets a reaping clutch 46 (described later) in a power transmission state and a power cutoff state.

FIG. 3 is a longitudinal sectional view of the reaping clutch case. In the figure, 42 is an input shaft rotatably disposed in the reaping clutch case 41, one end of which extends to the outside of the reaping clutch case 41, and the power of the engine is transmitted to that end. An input pulley 43 is attached. A gear 44 is attached to the other end of the input shaft 42 inside the reaping clutch case 41, and the gear 44 is a flat plate formed on the outer periphery of a clutch half 46a on the input side of a reaping clutch 46 using a pawl clutch. It meshes with the teeth.

The reaping clutch 46 is connected to the reaping clutch case 41.
An input-side clutch half 4 that is slidable in the axial direction of the input shaft 42 is attached to a clutch shaft 45 that is rotatably supported in parallel with the input shaft 42.
6a and an output clutch half 46b fixed to the input shaft 42. The input-side clutch half 46a of the reaping clutch 46 is pressed against the output-side clutch half 46b by a coil spring 47, and the pressing force of the coil spring 47 causes the claws 46c of both clutch halves 46a, 46b to engage. match.

A clutch fork 48 is engaged with the clutch half 46a on the input side.
8, the input side clutch half 46a is moved against the pressing force of the coil spring 47, and is disengaged from the output side clutch half 46b to be in a disengaged state.

Spur teeth are formed on the outer periphery of the clutch half body 46b on the output side, and the spur teeth are attached to an output shaft 51 that is rotatably supported by the reaping clutch case 41 parallel to the clutch shaft 45. It meshes with the gear 52. The rotation of the output shaft 51 is transmitted to the cutting blade 5 in the reaping section 7, the pulling device 6, the upper and lower conveying devices, and the vertical conveying device 8 to drive them.

The reaping clutch 46 has a safety clutch mechanism using a pawl clutch, and both clutch halves 46a,
If a heavy load is applied to the clutch half 46b on the output side while the pawl 46c of the clutch 46b is in the engaged state, the clutch half 46b will not be rotated, and the clutch half 46b will not rotate due to the rotation of the input clutch half 46a. half body 4
6a rotates in sliding contact with the other clutch half 46b, and each claw portion 46 of each clutch half 46a, 46b
As the clutch half 46a of the input shaft rotates, it disengages against the pressing force of the coil spring 47, and as it rotates further, it is engaged by the pressing force of the coil spring 47, and eventually each clutch half The claw portion repeatedly engages and disengages as the input side clutch half 46a rotates.

FIG. 4 is a partially cutaway front view of the reaping clutch case 41, and FIG. 5 is a side view of the main parts thereof. Input side clutch half 46a of the reaping clutch 46
The clutch fork 48 engaged with the reaping clutch case 41 has its end pivotally supported on the reaping clutch case 41 and extends outward, and the proximal end of the clutch arm 53 and the end thereof are extended outwardly. A switch contact plate 54 is fixedly provided. One end of a push-pull wire 55 is attached to the distal end of the clutch arm 53, and the other end of the push-pull wire 55 is attached to the proximal end of the reaping clutch lever 11 (see FIG. 2). Then, the clutch fork 48 is rotated by the rotation operation of the reaping clutch lever 11, and the reaping clutch 46 is in the power cut-off state with its clutch halves 46a, 46b disengaged, and the clutch halves 46a, 46b are disengaged.
46b is engaged, resulting in a power transmission state. The switch abutment plate 54 is designed to rotate as the clutch fork 48 rotates, and a limit switch 56 is disposed in its rotation range, and a safety clutch mechanism closes the clutch half 46a. is turned on when the clutch fork 48 is rotated by operating the reaping clutch lever 11 to disengage each clutch half body 46b.

FIG. 6 is a block diagram of the main parts of the control system of the harvester according to the present invention. In the figure, 60 is a control unit using a microcomputer, and each input terminal of the control unit 60 is connected to a main shift sensor 12 that detects in which traveling gear the main shift lever 10 in the main transmission device is located. A handling cylinder sensor 32 for detecting the rotational speed of the cylinder 30 and a limit switch 56 which is turned on when both clutch halves 46a and 46b of the reaping clutch 46 are in a disengaged state are connected to each other. Each output terminal of the control unit 60 includes each terminal of a shift motor 61 which is connected to the main shift lever 10 and whose rotation rotates the main shift lever 10 to change the running gear of the main transmission, and each other terminal. A terminal is connected to one end of each of an alarm lamp 61 and an alarm buzzer 62, each of which is connected to body ground.

Next, the main operations of the control unit 60 will be explained based on the flowchart of FIG. 1. The reaping clutch lever 11 is rotated to engage each of the clutch halves 46a and 46b of the reaping clutch 46,
The reaping clutch 46 is brought into a power transmitting state. As a result, the limit switch 56 is turned off, and the control section 60 controls the vehicle speed based on the number of rotations of the handling cylinder. That is, the handling cylinder 3 is detected by the handling cylinder sensor 31.
0 rotation speed is detected, and in a light load state of the handling cylinder where the handling cylinder rotation speed is higher than the appropriate range, the main shift sensor 12 detects the current running gear of the main transmission, and the running gear is set to the highest speed. When the traveling speed is not "F4", the shift motor 61 is driven in normal rotation to shift up to the first speed and increase the traveling speed, thereby increasing the amount of grain culm to be harvested and the threshing load. Even after the first gear is shifted up and the threshing load is increased, if the handling drum rotation speed is still in a light load state that is higher than the appropriate range, the first gear is further shifted up, and eventually the handling drum rotation speed is within the appropriate range. If this is not the case, shift up to the highest speed driving gear "F4".

On the other hand, if there is an overload condition in which the rotational speed of the handling barrel is lower than the appropriate range, the shift motor 61 is reversed and shifted down by one gear, reducing the machine running speed to reduce the amount of grain culm to be harvested and threshing. Lighten the load. Even when the threshing load is lightened by downshifting to the first gear, if the rotational speed of the handling cylinder is still below the appropriate range, the gear is further shifted down by one gear. Then, even when the lowest speed traveling gear is set to "F1", if the handling barrel rotation speed is lower than the appropriate range and is in an overload state, the shift motor 61 is driven in the reverse direction to set the main transmission to the traveling stop gear "N", and the aircraft The driver stops running the vehicle, lights up the warning lamp 62, and sounds the warning buzzer 63.

If an abnormality occurs in the cutting blade 5, vertical conveyance device 8, etc. in the reaping section 7, and a heavy load is applied to the output side clutch half 46b of the reaping clutch 46,
The rotation of the clutch half 46b is stopped, and the input side clutch half 46a repeats engagement and disengagement with the other clutch half 46b. When the reaping clutch 46 is disengaged, the limit switch 56 is turned on. When the limit switch 56 is turned on, the control unit 60 starts measuring time using a timer, and also records the number of times the limit switch 56 has been turned on and off, specifically. The counter that measures the number of times the limit switch 56 changes from on to off is reset (N
=0). Each time the limit switch 56 changes from the on state to the off state, the counter is incremented by one step, and if the count of the counter, that is, the number of times the limit switch 56 is turned on and off reaches a predetermined value K or more within a predetermined time, , the shift motor 61 is driven in the reverse direction to set the main transmission to the neutral gear "N", the aircraft stops traveling, and the warning lamp 6 is turned on.
2 lights up and the alarm buzzer 63 sounds. Further, in this case, vehicle speed control is not performed.

In other words, if the clutch halves 46a and 46b of the reaping clutch 46 are engaged and disengaged frequently within a relatively short period of time, a heavy load will be applied to the reaping section, causing the safety clutch mechanism of the reaping clutch 46 to fail. Assuming that this is the case, the main transmission is set to neutral stage "N", the traveling of the aircraft is stopped, the warning lamp 62 and the warning buzzer 63 are operated, and vehicle speed control is prohibited.

The limit switch 56 is also turned on when the reaping clutch lever 11 is operated to put the reaping clutch 46 in the power cutoff state. There is no repetition, therefore, the aircraft does not stop running, the warning lamp 62, the warning buzzer 63, etc. do not operate. Furthermore, when the power of the reaping clutch 46 is cut off, the vehicle speed control based on the rotational speed of the handling cylinder is not performed.

In addition, in the above-mentioned embodiment, the traveling of the machine is stopped when the safety clutch mechanism of the reaping clutch is operated, but in addition to this, the reaping clutch is configured to be in a power cut-off state, or the power is transmitted to the threshing section, and the machine is cut off. The threshing clutch may be configured to be in a power cutoff state.

〔effect〕

According to this invention, if the reaping section becomes overloaded and the safety clutch mechanism in the reaping clutch operates, the machine will stop traveling, so work can continue without the user realizing that the safety clutch mechanism is operating. Inconveniences caused by this, such as damage to uncut grain culms due to the reaping section not being driven, and if an abnormality occurs in the reaping section, can be prevented from expanding. In addition, since it is possible to clearly distinguish between when the reaping clutch lever is operated to put the reaping clutch in the power cut-off state and when the safety clutch mechanism of the reaping clutch is activated, the present invention has excellent effects such as eliminating the possibility of erroneous control. play.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a flowchart for explaining the operation of the harvester according to the present invention, FIG. 2 is a partially cutaway schematic left side view of the harvester according to the present invention, and FIG. 3 is a longitudinal sectional view of the reaping clutch case, FIG. 4 is a partially cutaway front view thereof, FIG. 5 is a side view of the main parts thereof, and FIG. 6 is a block diagram of the control system. 7...Reaping part, 11...Reaping clutch lever, 3
1... handling cylinder, 45... clutch shaft, 46... reaping clutch, 47... coil spring, 48... clutch fork, 56... limit switch, 61... shift motor.

Claims (1)

[Scope of utility model registration request] A reaping clutch equipped with a safety clutch mechanism that transmits and interrupts power to the reaping section and repeatedly engages and disengages due to overload of the reaping section when the power is being transmitted, and the reaping clutch's engagement and disengagement state. and a detector, and when the number of repetitions of engagement and disengagement of the reaping clutch within a predetermined time period by the detector reaches a predetermined value, the traveling of the machine is stopped. harvesting machine.